<header class="app-header navbar">
    <button class="navbar-toggler mobile-sidebar-toggler d-lg-none" type="button">&#9776;</button>
    <a class="navbar-brand" ui-sref="app.main"></a>
    <ul class="nav navbar-nav d-md-down-none">
        <li class="nav-item">
            <a class="nav-link navbar-toggler sidebar-toggler" href="#">&#9776;</a>
        </li>

    </ul>
</header>
